I am having a problem where some graphics devices print missing glyph boxes instead of characters. Actually, the only device I have tried so far that renders characters is PDF. Since I recently updated R and rebuilt a bunch of packages, I suspect that may have something to do with it. Here is a screenshot comparing output with four devices, jpeg, pdf, svg, and png.
Although I first encountered the problem in Rstudio with the rcorr package, the issue occurs when I run as an Rscript from the command line and with a basic boxplot.
require(corrplot)
M<-cor(mtcars)
corrplot(M, method="circle")
dev.off()
pdf("test2.pdf")
corrplot(M, method="circle")
dev.off()
png("test2.png")
corrplot(M, method="circle")
dev.off()
jpeg("test2.jpeg")
corrplot(M, method="circle")
dev.off()
svg("test2.svg")
corrplot(M, method="circle")
dev.off()
pdf("test3.pdf")
boxplot(M, method="circle")
dev.off()
png("test3.png")
boxplot(M, method="circle")
dev.off()
jpeg("test3.jpeg")
boxplot(M, method="circle")
dev.off()
svg("test3.svg")
boxplot(M, method="circle")
dev.off()
outputs:
